Rock-drill.



PATBNTBD JULY 18, 1905.

G. S. POWER. ROCK DRILL.

PrmoA'rIoN FILED PEB. 2a, 1905.

MOM

ATTORNEY.

UNTTnn STATES Patented July 18, 1905.

PATENT Ormea.

GEORGE S. POWER, OF PASSAIO, NET JERSEY, ASSIGNOR TO IVIOKES BROTHERS, OF NEV YORK, N. Y., A CORPORATION OF MICHIGAN.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 795,169, dated July 18, 1905.

Application tiled February 23, 1905. Serial No. 246,828.

T0 all wlw-mj t may concern:

Beit known that I, GEORGE S'. POWER, a resident of Passaic, Passaic county, in the State of New Jersey, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification.

This invention relates to an improved piston-packing, more particularly adapted for rock-drills, also to a piston and piston-rod integral therewith, for which the packing is especially designed; and the object of the invention is to provide a novel construction of rock-drill wherein the piston and piston-rod, with chuck or tool-holder, may be made in one forging', and to secure the two-part front head in such manner as to be steam-tight, and with a packing-nut made in one piece, containing' a split washer, (tapered, stepped, shouldered, or threaded in bottom thereof,) which can be screwed to the head in lieu of the customary two-piece gland bolted or otherwise ordinarily used.

To these and other ends, which will hereinafter appear, my invention comprises the novel features of improvement and combination and arrangement of parts, which will be hereinafter set forth, and finally pointed out in the appended claim.

Reference is to be had to the accompanying drawings, forming part hereof, wherein- Figure l illustrates in elevation a rockdrill, partially in section and showing onehalf of the neck through which the piston-rod passes. Eig. 2 is a plan view of the neck portion of the drill-cylinder with a portion of the cylinder proper attached. Fig. 3 is an enlarged end view of the neck portion of the drill-cylinder. Fig. 4 is a side elevation of one of the halves which go to form the neck, the view being taken on a line c a in Eig. 3. Fig. 5 is an end view of the packing-ring or washer as a whole. Fig. 6 is a cross-section taken on a line in Eig. 5; and Fig. 7 is a longitudinal section of the packing nut, showing a modified form of packing-ring therein.

Like numerals of reference indicate corresponding parts in the several views.`

The drill-cylinder shown in the accompanyular style of cylinder.

ing drawings is merely illustrative, the improvements not being limited to any partic- In said drawings the numeral 1 indicates a drill-cylinder which is provided with the usual valve-gear, feeding means, &c., and as these form no part of the present invention particular reference thereto will be dispensed with. To the cylinder l I attach, by means of bolts 2 2 or otherwise, a neck (or what is sometimes termed a front head) 3, the same being constructed in halves 4: and 5 and secured together by bolts or the like 6 and 7, lugs 8 and 9 being formed upon the neck for such purpose. The object of making the neck or front head 3 in halves is to obviate the necessity of any bushing within said neck, which would be necessary if the neck was solid, the neck itself by this construction iitting the piston-rod 19 directly, thereby lessening first cost and decreasing the chances of leakage. A projection 2 fits -the bore of the cylinder and alines the neck. One end of the neck 3 is threaded, as at 10, and is adapted to receive a gland 11. It Will be seen from the drawings that the gland l1 is provided with a tapered opening l2, and into said opening a bushing 13 is adapted to iit, said bushing being formed by the members 14 and l5. (See Eig. 5.) The neck 3 is provided with a l tapered opening 16, into which a packing substance can be forced by screwing the gland l1 up, said substance being placed in the space 17 intervening between the bushing 13 and the neck 3.

The piston 18, which is adapted to reciprocate within the bore of cylinder l, is formed integral with the piston-rod 19, which is provided upon its outer end with a drill-chuck 2O of any desired style. It will be obvious that a great advantage results from this construction of piston and rod. In the iirst place cost is less, and any loosening of parts cannot result from jar, as is the case when piston and rod are separably connected.

As will be seen, the front head or neck 3 surrounds the piston-rod 19, as does the bushing 13, the gland ll being formed in one piece and having the opening l2 larger at its smallest diameter than the diameter of the piston 18, and therefore the said gland can be slipped over said piston when assembling, or vice versa.

To assemble the parts, it is but necessary to first slip over the piston the gland 11. The halves or members 14 and 15 of the bushing 13 can then be placed upon the rod 19 and slipped into the opening 12 in the-gland 11. The halves or members l and 5 of the neck 3 can then be placed upon said piston-rod and secured together by the bolts 6 and 7, and the gland 11 can then be screwed onto said neck and adjusted as desired. Having done this, the piston can then be inserted into the bore of the cylinder 1 and the neck 3 secured to the said cylinder by the bolts 2. as shown.` The parts may, however, be assembled. in any suitable manner.

In the modified form shown in Fig. 7 the split bushing 21 is screwed into the gland 22, which is the same as the gland 11, excepting theA bore 23, which is straight instead of tapered, as is the opening 16. It will of course be understood that the neck 3 and bushing 13 will have a working lit with the pistonrod 19. It is obvious that the bushing 13 cannot be displaced or forced outwardly, owing to its tapered periphery.

Some of the advantages flowing from my improvements are, first, easy access to packing at all times without disturbing set of machine or removing the neck or head; second, outside packing is possible, the packing being applied on exterior end of neck or head; third,

by applying packing on outside end of neck or head it will admit of a longer bearing or guide in head for piston-rod than in ordinary constructions; fourth, by the arrangement of front head or neck, with gland 11 Vhaving the split bushing firmly secured in bottom thereof,

a packing oflarger section can be used, insuring greater compression and longer wear for the single application of packing than is usual in such constructions, and, fifth, the packing as applied in my construction being larger in section is less liable to become compact and hard and cut piston-rod, as frequently occurs with the use of packing of a smaller section.

Having now described my invention, what I claim, and desire to secure by Letters Patent, is-

' In a rock-drill, the combination of a cylinder, a piston having a piston-rod integral therewith, a neck or front head composed of halves detachably secured together, separably connected to said cylinder and adapted for a working lit with said piston-rod, a threaded portion upon said neck or head, an adjustable gland adapted to work upon said threaded portion, a tapered opening in said gland, and a tapered split bushing adapted to fit within said opening and to surround said piston-rod and pack same when said gland is adjusted.

GEORGE S. POVER.

Witnesses:

HAsKnL CORENTHAL, DAN HUsI-IFIELD. 

